Influence of Agricultural Wastes on the Activated Sludge Settleability

Two commonly used measures developed to quantify the settling characteristics of activated sludge are the sludge volume index (SVI) and the zone settling velocity (ZSV). Because of probability of sludge settling improvements by agricultural wastes, their impacts on sludge settling properties were principal objectives of this research. Average values of SVI for control (blank) sample was 823 mL/g. Optimum dosage for different agricultural wastes is defined as that reduced SVI to 100 mL/g (88 percent decrease). Average values of ZSV for control sample was 1.222 m/h. Different agricultural wastes increased ZSV of control samples up to 2 to 3 times.

Keywords:

activated sludge , sludge volume index , zone settling velocity , agricultural wastes